node生成验证码

var svgCaptcha = require('svg-captcha');
session.code = []
router.get('/bb', async (ctx, next) => {
  ctx.set('Access-Control-Allow-Origin', '*');
  var captcha = svgCaptcha.createMathExpr({
    ignoreChars: '0o1i',
    color:false,
    noise:0
  });
  session.code.push(captcha.text)
  ctx.body = captcha
})